Some DVI connectors use additional pins on the connector to send analog information from the display to the computer.

Connectors with additional pins are not compatible with the Apple Mini Display Port to DVI adapter.

VGA displays that use higher refresh rates (such as 85 Hz) at resolutions of 1600 x 1200 or greater may not generate video properly until you lower the refresh rate.Find answers to frequently asked questions about using an Apple Mini Display Port to Dual-Link DVI adapter, Apple Mini Display Port to DVI adapter, or Apple Mini Display Port to VGA adapter to connect your Mac to an external display.Note: The Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter, which connects Thunderbolt devices and Thunderbolt displays to Mac Book Pro models introduced in 2016, doesn't support connections to Mini Display Port displays.The Apple Mini Display Port to Dual-Link DVI adapter works best with displays that operate at dual-link resolutions, which are resolutions above 1920 x 1200.For displays that do not support dual-link DVI resolutions (displays that operate at resolutions of 1920 x 1200 or lower) you should use the Apple Mini Display Port to DVI adapter instead.

Note: Learn more about supported display configurations for the Mac Pro. The Mini DIsplay Port connector allows output to Mini Display Port, Display Port, VGA, DVI, and HDMI connections when using the proper cables and adapters.